第二次上机作业

1. 输入变量x的值，如果是1，输出x=1，如果是5，输出x=5，如果是 10，输出 x=10，除了以上几个值，都输出x=none

package hgj;
import java.util.Scanner;
public class dfg {

    public static void main(String[] args) {
        Scanner input= new Scanner(System.in);
        System.out.println("请输入x的值");
        int x=input.nextInt();
        if(x==1 || x==5 || x==10) {
            System.out.println("x="+x);
        }else {
            System.out.println("x=none");
        }
    }    
}

2.用switch结构写第1题

package huaerzi;
import java.util.Scanner;
public class huada {
    public static void main(String[] args) {
          // TODO Auto-generated method stub
        Scanner huaer= new Scanner(System.in);
        System.out.println("请输入a的值");
        int a=huaer.nextInt();
        switch(a) {
        case 1: 
        case 5: 
        case 10:
            System.out.println("a="+a);break;
        default:
            System.out.println("a=none");
             System.out.println("a=none");}
    }
}

3.判断一个数字是否能被5和6同时整除（打印能被5和6整除），或只能被5整除（打印能被5整除），或只能被6整除，（打印能被6整除），不能被5或6整除，（打印不能被5或6整除）

package hgj;
import java.util.Scanner;
public class dfg {

    public static void main(String[] args) {
        Scanner input= new Scanner(System.in);
         System.out.println("请输入这个数的值");
            int x=input.nextInt();
            if(x%5==0 && x%6==0) {
                System.out.println(x+"能被5和6整除");
            }else if(x%5==0 ){
                System.out.println(x+"能被5整除");
            }else if(x%6==0) {
                System.out.println(x+"能被6整除");
            }else {
                System.out.println(x+"不能被5或6整除");
            }
        }    
    }

4.输入一个0～100的分数，如果不是0～100之间，打印分数无效，根据分数等级打印 A(90-100),B(80-89),C,D,E

package huaerzi;
import java.util.Scanner;
public class huada {
    public static void main(String[] args) {
          // TODO Auto-generated method stub
        System.out.println("请输入一个整数");
        Scanner scanner = new Scanner(System.in);
        int grade = scanner.nextInt();
         if ((grade>100)||(grade<0)) {
        System.out.println("无效");
        } else if ((grade>=80)&&(grade<90)) {
        System.out.println("B");
        } else if ((grade>=90)&&(grade<=100)) {
        System.out.println("A");
        } else  if ((grade>=70)&&(grade<80)){
        System.out.println("C");
        } else if ((grade>=60)&&(grade<70)){
        System.out.println("D");
        }else System.out.println("E");
    }
}

5.输入三个整数x,y,z，请把这三个数由小到大输出（知识点：条件语句）

package xx;

import java.util.Scanner;

public class pika {

    public static void main(String[] args) {
        Scanner sc= new Scanner(System.in);
        System.out.println("请输入x的值");
        int x=sc.nextInt();
        System.out.println("请输入y的值");
        int y=sc.nextInt();
        System.out.println("请输入z的值");
        int z=sc.nextInt();
        if(x>y && y>z) {
            System.out.println("输出"+z+","+y+","+x);
        }else if(x>z && z>y) {
            System.out.println("输出"+y+","+z+","+x);
        }else if(y>x && x>z) {
            System.out.println("输出"+z+","+x+","+y);
        }else if(y>z && z>x) {
            System.out.println("输出"+x+","+z+","+y);
        }else if(z>y && y>x) {
            System.out.println("输出"+x+","+y+","+z);
        }else if(z>x && x>y) {
            System.out.println("输出"+y+","+x+","+z);
        }
    }

}